Efficiency increase of crystalline silicon solar cells with nanoimprinted rear side gratings for enhanced light trapping

Eisenlohr, Johannes; Tucher, Nico; Hauser, Hubert; Graf, M. B.; Benick, Jan; Bläsi, Bénédikt; Goldschmidt, Jan Christoph; Hermle, Martin

doi:10.1016/j.solmat.2016.06.033

Cited by 45 publications

(22 citation statements)

References 43 publications

(62 reference statements)

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“…This is suggests further benefits are attainable with the recent “electrically flat, optically textured” Si device configurations that improve light trapping using dielectric scattering patterns but still allow for the low surface recombination losses of planar cells. 44 , 45 …”

Section: Conclusion and Outlookmentioning

confidence: 99%

Nanoscale Back Contact Perovskite Solar Cell Design for Improved Tandem Efficiency

2017

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Tandem photovoltaics, combining absorber layers with two distinct band gap energies into a single device, provide a practical solution to reduce thermalization losses in solar energy conversion. Traditionally, tandem devices have been assembled using two-terminal (2-T) or four-terminal (4-T) configurations; the 2-T limits the tandem performance due to the series connection requiring current matching, while the standard 4-T configuration requires at least three transparent electrical contacts, which reduce the total collected power due to unavoidable parasitic absorption. Here, we introduce a novel architecture based on a nanoscale back-contact for a thin-film top cell in a three terminal (3-T) configuration. Using coupled optical–electrical modeling, we optimize this architecture for a planar perovskite-silicon tandem, highlighting the roles of nanoscale contacts to reduce the required perovskite electronic quality. For example, with an 18% planar silicon base cell, the 3-T back contact design can reach a 32.9% tandem efficiency with a 10 μm diffusion length perovskite material. Using the same perovskite quality, the 4-T and 2-T configurations only reach 30.2% and 24.8%, respectively. We also confirm that the same 3-T efficiency advantage applies when using 25% efficient textured silicon base cells, where the tandems reach 35.2% and 32.8% efficiency for the 3-T, and 4-T configurations, respectively. Furthermore, because our design is based on the individual subcells being back-contacted, further improvements can be readily made by optimizing the front surface, which is left free for additional antireflective coating, light trapping, surface passivation, and photoluminescence outcoupling enhancements.

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Section: Conclusion and Outlookmentioning

confidence: 99%

Nanoscale Back Contact Perovskite Solar Cell Design for Improved Tandem Efficiency

2017

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“…This concept of rear side gratings is especially interesting for very thin solar cells as they suffer from incomplete absorption in the near infrared regime and thus light trapping gains in importance. In [31], this is demonstrated theoretically and experimentally for solar cell thicknesses of 250 µm, 150 µm and 100 µm. The processing of such thin silicon wafers of course is very demanding especially when thinking about a mechanical moulding process as for NIL.…”

Section: Solar Cell Applicationsmentioning

confidence: 85%

“…[30]. The whole process chain for solar cell fabrication as well as the embedding of the patterning :SE410 xtaiC SeRe`1Af11 processes and results are thoroughly described in [31]. This concept of rear side gratings is especially interesting for very thin solar cells as they suffer from incomplete absorption in the near infrared regime and thus light trapping gains in importance.…”

Section: Solar Cell Applicationsmentioning

confidence: 99%

Large area patterning using interference and nanoimprint lithography

et al. 2016

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Interference lithography (IL) is the best suited technology for the origination of large area master structures with high resolution. In prior works, we seamlessly pattern areas of up to 1.2 x 1.2 m2 with periodic features, i.e. a diffraction grating with a period in the micron range. For this process we use an argon ion laser emitting at 363.8 nm. Thus, feasible periods are in the range of 100 μm to 200 nm. Edge-defined techniques or also called (self-aligned) double patterning processes can be used to double the spatial frequency of such structures. This way, we aim to reduce achievable periods further down to 100 nm. In order to replicate master structures, we make use of nanoimprint lithography (NIL) processes. In this work, we present results using IL as mastering and NIL as replication technology in the fields of photovoltaics as well as display and lighting applications. In photovoltaics different concepts like the micron-scale patterning of the front side as well as the realization of rear side diffraction gratings are presented. The benefit for each is shown on final device level. In the context of display and lighting applications, we realized various structures ranging from designed, symmetric or asymmetric, diffusers, antireflective and/or antiglare structures, polarization optical elements (wire grid polarizers), light guidance and light outcoupling structures

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“…. The large surface area makes it a very active material; in this case, approximately 20 % of silicon atoms are arranged at the inner surface of PS [21,22]. PS in terms of its morphology can be modeled as an array of cylindrical pores.…”

Section: The Aim and Tasks Of The Studymentioning

confidence: 99%

Development of efficient solar cells with the use of multifunctional multitextures

Yerokhov

Ierokhova

2017

EEJET

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Efficiency increase of crystalline silicon solar cells with nanoimprinted rear side gratings for enhanced light trapping

Cited by 45 publications

References 43 publications

Nanoscale Back Contact Perovskite Solar Cell Design for Improved Tandem Efficiency

Nanoscale Back Contact Perovskite Solar Cell Design for Improved Tandem Efficiency

Large area patterning using interference and nanoimprint lithography

Development of efficient solar cells with the use of multifunctional multitextures

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